Diphenhydramine vs Tofacitinib

## Diphenhydramine vs Tofacitinib: Overview

This comparison examines the pharmacological differences between **Diphenhydramine** and **Tofacitinib**.

## Mechanism of Action

**Diphenhydramine**: First-generation H1 antihistamine with anticholinergic properties.

**Tofacitinib**: Pan-JAK inhibitor with preference for JAK1 and JAK3 blocking pro-inflammatory cytokine signaling.

## Pharmacokinetics

**Half-life**: Diphenhydramine — 2-8 hours; Tofacitinib — 3.2 hours.

## Chemical Properties

**Molecular Formula**: Diphenhydramine — C17H21NO; Tofacitinib — C16H20N6O.

**Molecular Weight**: Diphenhydramine — 255.3550 g/mol; Tofacitinib — 312.3700 g/mol.

**Type**: Diphenhydramine — Small molecule; Tofacitinib — Small molecule.